It is revealed in verses of the Qur’an and hadiths that the moral values and virtues of the Qur’an and the Sunnah of the Prophet (saas) will rule the world

Allah reveals in the Noble Qur’an that He will cause the moral values of the Qur’an to rule the world, that He will bestow power, dominion, strength and superiority on His true servants, that after a life full of troubles and oppression Muslims will be granted ease:
 

Allah has promised those of you who believe and do right actions that He will make them successors in the land as He made those before them successors, and will firmly establish for them their religion with which He is pleased and give them, in place of their fear, security. ... (Surat an-Nur, 55)

[Their Lord revealed to them,] “We will leave you the land to live in after them. That is the reward of those who fear My station and fear My threat.” They asked for Allah’s victory, and every obdurate tyrant failed. (Surah Ibrahim, 14-15)

When Allah’s help and victory have arrived and you have seen people entering Allah’s religion in droves, then glorify your Lord’s praise and ask His forgiveness. He is the Ever-Returning. (Surat an-Nasr, 1-3)
 

In the hadiths transmitted from the Prophet (saas), we are told that Hazrat Mahdi (as) will appear in Hijri 1400 and will cause the moral values of Islam to rule the world. There will be a glorious climate in his day, in which peace, calm, justice, sovereignty, plenty, well-being and happiness prevail across the world. Some of the hadiths transmitted from our Prophet (saas) concerning the time of Hazrat Mahdi (as) read as follows:
 

PEOPLE WILL GATHER AROUND HAZRAT MAHDI (AS) IN THE YEAR 1400. (Risalat al-Khuruj al-Mahdi, p. 108)

Miqdad ibn al-Aswad says: I heard the Messenger of Allah (saas) say, "there will be nowhere that Islam has not entered, not a house made out of mud or a tent (in the desert)." (Abu Ali Fadal ibn Hassan ibn al-Fadl al-Tabarsi, Majma' al-Bayan fee Tafsir al-Qur'an, from the commentary on verse 33 of Surat at-Tawba)

... Hazrat Mahdi’s (as) Qur’anic sovereignty [the dominion of Qur’anic moral values] WILL PERVADE THE EAST AND WEST OF THE EARTH... (Al-Mahdiyy al-Maw'ud, Vol. 1, p. 254- 255)

... He [Hazrat Mahdi (as)] will possess the Earth and fill it with justice, just as it has been filled with oppression and corruption. So whoever reaches him ought to come and join him, even if crawling on the snow, since he is Hazrat Mahdi (as). (Al-Muttaqi al-Hindi, Al-Burhan fi Alamat al-Mahdi Akhir az-Zaman, p. 14)

Below is the short biography of the great Sunni scholar Muhammad ibn 'Abd al-Rasul al-Barzanji:

… He [Hazrat Mahdi (as)] will fill the world that is full of oppression and evils with justice and mercy. (Sunan Abu Dawud and Tirmidhi)

His [Hazrat Mahdi’s (as)] justice will cover all places and he will rule among people with the Sunnah of the Prophet (saas). (Ibn Hajar al-Haythami, Al-Qawl al-Mukhtasar fi `Alamat al-Mahdi al-Muntadhar, p. 20)

… He will fill the earth with truth and justice, just as it is now filled with cruelty and torture. (Sunan Abu Dawud, 5/93)

His [Hazrat Mahdi’s (as)] justice will be as such that he will not wake a sleeping person or even shed one drop of blood. (Ibn Hajar al-Haythami, Al-Qawl al-Mukhtasar fi `Alamat al-Mahdi al-Muntadhar, p. 29)

Like the cup fills with water, so will earth fill with peace. There will be no enmity left between any people. All hostility, fighting, and envy will disappear. ... (Sahih Muslim, 1/136)

Once the earth is full of cruelty and enmity, one [Hazrat Mahdi (as)] from my Ahl al-Bayt will emerge. He will fill the earth with justice, just as it was previously filled with oppression and enmity. (Al-Muttaqi al-Hindi, Al-Burhan fi Alamat al-Mahdi Akhir az-Zaman, p. 11)

... Security will permeate all over earth and even a few women will be able to fulfill their hajj without the company of men. (Ibn Hajar al-Haythami, Al-Qawl al-Mukhtasar fi `Alamat al-Mahdi al-Muntadhar, p. 47)

Hazrat Mahdi (as) will emerge from my community. Almighty Allah will send him to make people rich. My community will be blessed in that time, animals will live in plenty and the Earth will give forth many goods, Hazrat Mahdi (as) will justly distribute many, many goods among people. (Ibn Hajar al-Haythami, Al-Qawl al-Mukhtasar fi `Alamat al-Mahdi al-Muntadhar, p. 23)

He [Hazrat Mahdi (as)] will generously distribute goods among people without weighing or counting them. (Ibn Hajar al-Haythami, Al-Qawl al-Mukhtasar fi `Alamat al-Mahdi al-Muntadhar, p. 23)

… Due to the prevailing abundance none will accept them. (Sunan Ibn Majah, 10/340)

If, however, there is still anyone who denies that the moral values of Islam will rule the world in this century, despite the verses of the Qur’an and the hadiths of our Prophet (saas) in which Allah reveals His promise, then that person has to prove his logic, which is the reason for his denial, to Muslims using verses and trustworthy hadiths in the same way. He would have to explain to Muslims why Hazrat Mahdi (as) will not be instrumental in the global dominion of Islamic moral values in this century and why they should abandon any such hopes, using clear evidence, and an accessible and uncomplicated language, as well as the trustworthy hadiths narrated from the Prophet (saas).

But if he says; “Islamic moral values will prevail this century” then he must also say “There must be someone who will cause the moral values of Islam to rule the world, and that is the Great Mahdi (as) of the End Times who will appear in Hijri 1400.”  

There is no doubt that, as Allah foretells in His verses and as the Prophet (saas) explicitly states in the hadiths, Hazrat Mahdi (as) will be instrumental in the rule of Islamic moral values, by Allah’s leave. No matter how much some people with evil intentions may seek to conceal, cover up or prevent this, their devilish efforts will serve no purpose. Nobody will ever be able to interfere with the law of Allah, and in the same way that a saintly figure, a guide, came in previous centuries to purge the religion of subsequent innovations, so Allah had given that duty to Hazrat Mahdi (as) in this century and, by His leave, he will perform this great task of the End Times.  
 

THEY DESIRE TO EXTINGUISH ALLAH’S LIGHT WITH THEIR MOUTHS. BUT ALLAH REFUSES TO DO OTHER THAN PERFECT HIS LIGHT, EVEN THOUGH THE UNBELIEVERS DETEST IT. (SURAT AT-TAWBA, 32)